Re: modeling either/or relationship...

From: JOG <>
Date: 2 Feb 2006 15:35:15 -0800
Message-ID: <>

-CELKO- wrote:
> >> Still, I get this strange feeling thinking about NULLs in UNIQUE. <<
> We did, too. I can only vaguely remember the arguements in X3H2 now.
> Basically, we said that there is equality and there is grouping, as in
> GROUP BY. NULLs fail equality, but get grouped together. The
> REFERENCES clause uses grouping and not equality.
> As we used to say about OS/JCL, it makes perfect sense after you work
> with it for decade :)

"All roads lead to rome"...

do "all threads on comp.theory.database lead to nulls?" Received on Fri Feb 03 2006 - 00:35:15 CET

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